> Do eBay Collins prices follow the price of oil and gasoline? As a second example, in the late 50's the list price of a 75A-4 was $695. Today the average E-bay price seems to be $939. Gas prices went up by a factor of 11 over the last 50 years. If radios went up as fast, the 75A-4 would be $7700 today. Tim.